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Practical Byzantine Fault Tolerance (PBFT)

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Table of contents
    1. 0.2. How PBFT Works
    2. 0.4. Why PBFT Matters

Practical Byzantine Fault Tolerance (PBFT) is a consensus algorithm designed to keep a decentralized network secure and operational, even if some nodes act maliciously or fail to respond.

How PBFT Works

PBFT builds on the Byzantine Generals Problem, where participants must reach agreement despite potential traitors. In PBFT, nodes communicate through multiple rounds of voting to agree on a transaction before it’s added to the ledger. It can tolerate up to one-third of nodes being faulty or malicious without compromising the system’s integrity.

Why PBFT Matters

PBFT is especially useful for permissioned blockchains where performance and fault tolerance are priorities. It offers fast finality and low energy use, making it an attractive alternative to proof-of-work systems. Projects like Hyperledger Fabric use PBFT-based mechanisms to ensure trust and reliability in enterprise environments.